Oxybutynin for Post-surgical Bladder Pain and Urgency

Inclusion Criteria: * Patients who will undergo bladder surgery that requires an indwelling bladder catheter after surgery. * Age Range: Four to 8 years of age are eligible for the study. Exclusion Criteria: * Patients who have had prior bladder surgery. * Patients who have neurologic disease that could impair bladder sensation. * Patients who are already taking antimuscarinic or antispasmodic medications. * Patients with glaucoma, any neurologic disease, dementia, impaired mentation or disorder of the central nervous system. * Patients taking any medication that affects the central nervous system such as antidepressant, anxiolytic or antipsychotic medications. * Less than four years of age cannot have the transdermal patch due to fixed dose. Over 8 years of age: less than 5% of our patients, who undergo this surgery, are over 8 years of age and is usually a rare adolescent. Data in an older cohort may confuse the results since they respond differently to bladder surgery due to larger incision and longer hospital stay with a catheter.